<template>
    <div class="star" :class="starType">
        <span v-for="itemClass in itemClasses" :class="itemClass" class="star-item" track-by="$index"></span>
    </div>
</template>

<script>
const LENGTH=5;
const CLS_ON='on';
const CLS_HALF='half';
const CLS_OFF='off';

export default {
    props:{
        size:{
            type:Number
        },
        score:{
            type:Number
        }
    },
    computed:{
        starType(){
            return 'star-'+this.size;
        },
        itemClasses(){
            let result=[];
            let score=Math.floor(this.score*2)/2;
            let hasDecimal=score%1!==0;
            let integer=Math.floor(score);
            for(let i=0;i<integer;i++){
                result.push(CLS_ON);
            }
            if(hasDecimal){
                result.push(CLS_HALF);
            }
            while(result.length<LENGTH){
                result.push(CLS_OFF);
            }
            return result;
        }
    }
}
</script>

<style lang="stylus">
    @import "../../common/stylus/mixin"
    .star
        font-size 0 
        .star-item
            display inline-block
            background-repeat no-repeat
        &.star-48
            .star-item
                width 20px
                height 20px
                margin-right 22px
                background-size 20px 20px 
                &:last-child
                    margin-right 0 
                &.on
                    bg-image('star48_on')
                &.half
                    bg-image('star48_half')
                &.off
                    bg-image('star48_off')
        &.star-36
            .star-item
                width 15px
                height 15px
                margin-right 6px
                background-size 15px 15px 
                &:last-child
                    margin-right 0 
                &.on
                    bg-image('star36_on')
                &.half
                    bg-image('star36_half')
                &.off
                    bg-image('star36_off')
        &.star-24
            .star-item
                width 10px
                height 10px
                margin-right 3px
                background-size 10px 10px 
                &:last-child
                    margin-right 0 
                &.on
                    bg-image('star24_on')
                &.half
                    bg-image('star24_half')
                &.off
                    bg-image('star24_off')
        

</style>


